Which one of the following is NOT an environmental issue related to coal mining?
A. subsidence of the land surface
B. loss of jobs in the mining industry
C. air pollution
D. acid mine drainage
Answer: B
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Farmers in the Midwestern United States routinely rotate between soybean and corn crops. Sometimes it is said that they do this because the soybeans introduce nitrogen into the soil
Although this is true, farmers also rotate their corn and soybean crops as a form of A) cultural control. B) natural enemies. C) genetic control. D) natural chemical control.
Intrusive igneous rocks consist of slowly cooled magma
Indicate whether the statement is true or false
Which of the following is true when comparing two electrons which are in different shells of an atom?
A) The electron in the higher numbered shell is closer to the nucleus and is easier to remove. B) The electron in the higher numbered shell is closer to the nucleus and is harder to remove. C) The electron in the higher numbered shell is further from the nucleus and is easier to remove. D) The electron in the higher numbered shell is further from the nucleus and is harder to remove.
The Kuiper belt is the source for ________.
A. shooting stars B. long-period comets C. asteroids D. short-period comets